i believe you have accurately described the situation, but it is most certainly incomplete. i have no idea what other factors may be involved. two drops of SSKI is not very much.
this could be something else entirely separate from the iodine as in something she encountered on the trip. or, it could be something that was encountered on the trip that the iodine has now exacerbated because of a low dose or lack of elemental iodine. did you fly? did you go out of country? does she have a history of gross exposure to mercury as in amalgams? did she ever take a supplement with elemental iodine in it or just KI?